Provide mutable members of UrlRequestContext via pure-virtual interface

net/url_request/url_request_context.cc

Index: net/url_request/url_request_context.cc
diff --git a/net/url_request/url_request_context.cc b/net/url_request/url_request_context.cc
index b9ee75f329d5c26bdccc9d181aab656d0b9f2b07..8c06e05cc3ef4e34226b8809aa1ece085d0ac151 100644
--- a/net/url_request/url_request_context.cc
+++ b/net/url_request/url_request_context.cc
@@ -12,6 +12,7 @@
 #include "net/cookies/cookie_store.h"
 #include "net/ftp/ftp_transaction_factory.h"
 #include "net/http/http_transaction_factory.h"
+#include "net/url_request/http_user_agent_settings.h"
 #include "net/url_request/url_request.h"
 
 namespace net {
@@ -34,6 +35,7 @@ URLRequestContext::URLRequestContext()
       ftp_transaction_factory_(NULL),
       job_factory_(NULL),
       throttler_manager_(NULL),
+      http_user_agent_settings_(NULL),
       url_requests_(new std::set<const URLRequest*>) {
 }
 
@@ -56,8 +58,7 @@ void URLRequestContext::CopyFrom(const URLRequestContext* other) {
   set_cookie_store(other->cookie_store_);
   set_transport_security_state(other->transport_security_state_);
   // FTPAuthCache is unique per context.
-  set_accept_language(other->accept_language_);
-  set_accept_charset(other->accept_charset_);
+  set_http_user_agent_settings(other->http_user_agent_settings_);
   set_referrer_charset(other->referrer_charset_);
   set_http_transaction_factory(other->http_transaction_factory_);
   set_ftp_transaction_factory(other->ftp_transaction_factory_);
@@ -85,8 +86,19 @@ void URLRequestContext::set_cookie_store(CookieStore* cookie_store) {
   cookie_store_ = cookie_store;
 }
 
+const std::string& URLRequestContext::accept_charset() const {
+  return http_user_agent_settings_ ?
+      http_user_agent_settings_->GetAcceptCharset() : EmptyString();
+}
+
+const std::string& URLRequestContext::accept_language() const {
+  return http_user_agent_settings_ ?
+      http_user_agent_settings_->GetAcceptLanguage() : EmptyString();
+}
+
 const std::string& URLRequestContext::GetUserAgent(const GURL& url) const {
-  return EmptyString();
+  return http_user_agent_settings_ ?
+      http_user_agent_settings_->GetUserAgent(url) : EmptyString();
 }
 
 void URLRequestContext::AssertNoURLRequests() const {